Gibbs and Mashburn cartridges.

[.30 Newton]

Hi guys.

I wondered if anyone on this forum is using the Gibbs cartridges. I'm interested in both cases and reloading data for an article I am writing.

I'm also interested in the Mashburn cartridges and info on them.

Thanks
Allan

[Ridge Runner]

I have a 6.5 Gibbs, which I use for a long range groundhog and deer rifle, what ya need to know?
RR

[.30 Newton]

Hi

We have been in contact regarding the 6.5 Gibbs.

I'm looking for reloading data, hunting experiences as well as cases.

[Ridge Runner]

ok, your right, your case is on the way, mailed them last monday I think.
from my research the 7mm mashburn super mag was basicly an early version of the 7mm stw, ballistics are identicle with the powders available during that time period, only differences I could find were, the 7mm MSM is .225" shorter and has a 28.12° shoulder instead of the 25° shoulder of the STW (one of those on the way also)
RR

[Ridge Runner]

some gibbs data http://www.reloadersnest.com/frontpa...?CaliberID=317
they also have a few loads for the 7mm MSM
RR

[.30 Newton]

RR, thanks for sending the cases and for the link to the reloading data.

[Vapodog]

6.5 Gibbs

Here are all the loads for the 6.5 Gibbs listed on www.loaddata.com.

These are from Handloader #148

6.5 Gibbs / 6.5mm Gibbs

Warning! Notes: Federal 215 primers used in all loads. Powder and ambient temperature 70 to 85 degrees F. All velocities instrumental at 10 feet to middle of screens. All loads targeted at 200 yards except cast bullet load. Rifle: M98 26-inch Shilen barrel, one-in-9-inch twist. (Handloader Issue 148)
Be Alert: Publisher cannot be responsible for errors in published load data.

Wt. Bullet Powder Manufacturer Powder Charge Velocity (FPS)
100 Hornady Accurate AAC-3100 61.0 3,433
Remarks: brass: FC; under two inches at 200 yds

100 Hornady IMR IMR-7828 62.0 3,330
Remarks: brass: FC; under two inches at 200 yds

100 Hornady Alliant RL-22 62.0 3,469
Remarks: brass: FC; under two inches at 200 yds

100 Hornady IMR IMR-4350 56.0 3,324
Remarks: brass: FC; under two inches at 200 yds

120 Nosler Ball. Tip Accurate AAC-3100 58.0 3,264
Remarks: brass: WW; under two inches at 200 yds

120 Remington IMR IMR-4831 58.0 3,314
Remarks: brass: FC; under three inches at 200 yds

120 Speer Alliant RL-22 59.0 3,330
Remarks: brass: WW; under one inch at 200 yds

120 Sierra Hodgdon H-450 58.0 3,250
Remarks: brass: WW; under one inch at 200 yds

120 Nosler SB IMR IMR-7828 60.0 3,270
Remarks: brass: RP; under three inches at 200 yds

125 Nosler IMR IMR-7828 59.0 3,188
Remarks: brass: WW; under one inch at 200 yds

129 Hornady IMR IMR-4831 58.0 3,099
Remarks: brass: RP; under three inches at 200 yds

129 Hornady Alliant RL-19 57.0 3,097
Remarks: brass: RP; under three inches at 200 yds

140 Sierra GK IMR IMR-7828 58.0 3,039
Remarks: brass: WW; under two inches at 200 yds

140 Sierra GK Alliant RL-22 56.0 3,018
Remarks: brass: WW; under two inches at 200 yds

140 Sierra GK Hodgdon H-870 65.0 3,063
Remarks: brass: WW; under one inch at 200 yds

140 Sierra GK IMR IMR-4350 52.0 2,960
Remarks: brass: WW; under two inches at 200 yds

140 Sierra GK Accurate AAC-3100 55.0 3,034
Remarks: brass: WW; under two inches at 200 yds

140 Sierra GK IMR IMR-4831 55.0 3,041
Remarks: brass: WW; under one inch at 200 yds

140 Sierra GK Alliant RL-19 55.0 3,027
Remarks: brass: WW; under two inches at 200 yds

140 Sierra GK Hodgdon H-5010 68.0 3,088
Remarks: brass: WW; under one inch at 200 yds; vibrated then compressed

A little sidelight.....Rocky Gibbs always measured barrel length by extending a cleaning rod to the tip of a loaded chamber from the barrel's muzzle and measuring that length.....essentially he believed the barrel length should indicate the distance a bullet traveled while in the barrel.....Thus Mr Gibbs data was taken from barrels at least 3" longer than he said!!!!!

Also, Folks with Gibbs and Ackley chambers are known to blow more smoke than a politician!!!!...so take some of this as "pucky"....start at least seven grains low and work up!

[Ridge Runner]

vapo, your right the 140/re22 load listed is 6 gr under where the smith that built it reccomended.
RR

[.30 Newton]

Thanks, very useful info. I see the 6.5 Gibbs gets some good velocities.

Any other Gibbs shooters out there?

[Vapodog]

Hey .30.....lets just ask one question.....If the Gibbs, Ackleys, and other such wildcats were so darn good.....why weren't they adopted by the majors like the .35 Whelen, .25-06, .22-250 were.....

Yes Nosler adopted the .280 AI.....but it was a marketing scam more than a real performance issue!

Here's the reality.....the standard 6.5-06 will get you anyplace the 6.5 Gibbs will or the AI verson will or anything else based on the .30-06 case.....it will feed nicely and be easy to reload

If you really want more look to the .264 Magnum.....and believe me....it's also not a lot more!

Mashburn?.....nice cartridge but still the question prevails.....if it was all that good and wasn't surrounded by bullpucky, the majors would have adopted it.....

Having said all that, let me now say this.....there isn't any 6.5 cartridge that I'm aware of that is significantly better than the old plain vanilla .270 Winchester!!!!!!!